In this study, we examined the abiotic and biotic factors controlling the dynamics of soil respiration (R) while considering the zonal distribution of plant species in a coastal dune ecosystem in western Japan, based on periodic R data and continuous environmental data. We set four measurement plots with different vegetation compositions: plot 1 on bare sand; plot 2 on a cluster of young Vitex rotundifolia seedlings; plot 3 on a mixture of Artemisia capillaris and V. rotundifolia; and plot 4 on the inland boundary between the coastal vegetation zone and a Pinus thunbergii forest. R increased exponentially along with the seasonal rise in soil temperature, but summer drought stress markedly decreased R in plots 3 and 4. There was a significant positive correlation between the natural logarithm of belowground plant biomass and R in autumn. Our findings indicate that the seasonal dynamics of R in this coastal dune ecosystem are controlled by abiotic factors (soil temperature and soil moisture), but the response of R to drought stress in summer varied among plots that differed in dominant vegetation species. Our findings also indicated that the spatial dynamics of R are mainly controlled by the distribution of belowground plant biomass and autotrophic respiration.
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| http://dx.doi.org/10.1038/s41598-022-17787-8 | DOI Listing |
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